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TOMOYO Linux Cross Reference
Linux/include/drm/drm_dp_mst_helper.h

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  1 /*
  2  * Copyright © 2014 Red Hat.
  3  *
  4  * Permission to use, copy, modify, distribute, and sell this software and its
  5  * documentation for any purpose is hereby granted without fee, provided that
  6  * the above copyright notice appear in all copies and that both that copyright
  7  * notice and this permission notice appear in supporting documentation, and
  8  * that the name of the copyright holders not be used in advertising or
  9  * publicity pertaining to distribution of the software without specific,
 10  * written prior permission.  The copyright holders make no representations
 11  * about the suitability of this software for any purpose.  It is provided "as
 12  * is" without express or implied warranty.
 13  *
 14  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 15  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 16  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 17  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 18  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 19  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 20  * OF THIS SOFTWARE.
 21  */
 22 #ifndef _DRM_DP_MST_HELPER_H_
 23 #define _DRM_DP_MST_HELPER_H_
 24 
 25 #include <linux/types.h>
 26 #include <drm/drm_dp_helper.h>
 27 
 28 struct drm_dp_mst_branch;
 29 
 30 /**
 31  * struct drm_dp_vcpi - Virtual Channel Payload Identifier
 32  * @vcpi: Virtual channel ID.
 33  * @pbn: Payload Bandwidth Number for this channel
 34  * @aligned_pbn: PBN aligned with slot size
 35  * @num_slots: number of slots for this PBN
 36  */
 37 struct drm_dp_vcpi {
 38         int vcpi;
 39         int pbn;
 40         int aligned_pbn;
 41         int num_slots;
 42 };
 43 
 44 /**
 45  * struct drm_dp_mst_port - MST port
 46  * @kref: reference count for this port.
 47  * @guid_valid: for DP 1.2 devices if we have validated the GUID.
 48  * @guid: guid for DP 1.2 device on this port.
 49  * @port_num: port number
 50  * @input: if this port is an input port.
 51  * @mcs: message capability status - DP 1.2 spec.
 52  * @ddps: DisplayPort Device Plug Status - DP 1.2
 53  * @pdt: Peer Device Type
 54  * @ldps: Legacy Device Plug Status
 55  * @dpcd_rev: DPCD revision of device on this port
 56  * @num_sdp_streams: Number of simultaneous streams
 57  * @num_sdp_stream_sinks: Number of stream sinks
 58  * @available_pbn: Available bandwidth for this port.
 59  * @next: link to next port on this branch device
 60  * @mstb: branch device attach below this port
 61  * @aux: i2c aux transport to talk to device connected to this port.
 62  * @parent: branch device parent of this port
 63  * @vcpi: Virtual Channel Payload info for this port.
 64  * @connector: DRM connector this port is connected to.
 65  * @mgr: topology manager this port lives under.
 66  *
 67  * This structure represents an MST port endpoint on a device somewhere
 68  * in the MST topology.
 69  */
 70 struct drm_dp_mst_port {
 71         struct kref kref;
 72 
 73         /* if dpcd 1.2 device is on this port - its GUID info */
 74         bool guid_valid;
 75         u8 guid[16];
 76 
 77         u8 port_num;
 78         bool input;
 79         bool mcs;
 80         bool ddps;
 81         u8 pdt;
 82         bool ldps;
 83         u8 dpcd_rev;
 84         u8 num_sdp_streams;
 85         u8 num_sdp_stream_sinks;
 86         uint16_t available_pbn;
 87         struct list_head next;
 88         struct drm_dp_mst_branch *mstb; /* pointer to an mstb if this port has one */
 89         struct drm_dp_aux aux; /* i2c bus for this port? */
 90         struct drm_dp_mst_branch *parent;
 91 
 92         struct drm_dp_vcpi vcpi;
 93         struct drm_connector *connector;
 94         struct drm_dp_mst_topology_mgr *mgr;
 95 
 96         struct edid *cached_edid; /* for DP logical ports - make tiling work */
 97 };
 98 
 99 /**
100  * struct drm_dp_mst_branch - MST branch device.
101  * @kref: reference count for this port.
102  * @rad: Relative Address to talk to this branch device.
103  * @lct: Link count total to talk to this branch device.
104  * @num_ports: number of ports on the branch.
105  * @msg_slots: one bit per transmitted msg slot.
106  * @ports: linked list of ports on this branch.
107  * @port_parent: pointer to the port parent, NULL if toplevel.
108  * @mgr: topology manager for this branch device.
109  * @tx_slots: transmission slots for this device.
110  * @last_seqno: last sequence number used to talk to this.
111  * @link_address_sent: if a link address message has been sent to this device yet.
112  *
113  * This structure represents an MST branch device, there is one
114  * primary branch device at the root, along with any others connected
115  * to downstream ports
116  */
117 struct drm_dp_mst_branch {
118         struct kref kref;
119         u8 rad[8];
120         u8 lct;
121         int num_ports;
122 
123         int msg_slots;
124         struct list_head ports;
125 
126         /* list of tx ops queue for this port */
127         struct drm_dp_mst_port *port_parent;
128         struct drm_dp_mst_topology_mgr *mgr;
129 
130         /* slots are protected by mstb->mgr->qlock */
131         struct drm_dp_sideband_msg_tx *tx_slots[2];
132         int last_seqno;
133         bool link_address_sent;
134 };
135 
136 
137 /* sideband msg header - not bit struct */
138 struct drm_dp_sideband_msg_hdr {
139         u8 lct;
140         u8 lcr;
141         u8 rad[8];
142         bool broadcast;
143         bool path_msg;
144         u8 msg_len;
145         bool somt;
146         bool eomt;
147         bool seqno;
148 };
149 
150 struct drm_dp_nak_reply {
151         u8 guid[16];
152         u8 reason;
153         u8 nak_data;
154 };
155 
156 struct drm_dp_link_address_ack_reply {
157         u8 guid[16];
158         u8 nports;
159         struct drm_dp_link_addr_reply_port {
160                 bool input_port;
161                 u8 peer_device_type;
162                 u8 port_number;
163                 bool mcs;
164                 bool ddps;
165                 bool legacy_device_plug_status;
166                 u8 dpcd_revision;
167                 u8 peer_guid[16];
168                 u8 num_sdp_streams;
169                 u8 num_sdp_stream_sinks;
170         } ports[16];
171 };
172 
173 struct drm_dp_remote_dpcd_read_ack_reply {
174         u8 port_number;
175         u8 num_bytes;
176         u8 bytes[255];
177 };
178 
179 struct drm_dp_remote_dpcd_write_ack_reply {
180         u8 port_number;
181 };
182 
183 struct drm_dp_remote_dpcd_write_nak_reply {
184         u8 port_number;
185         u8 reason;
186         u8 bytes_written_before_failure;
187 };
188 
189 struct drm_dp_remote_i2c_read_ack_reply {
190         u8 port_number;
191         u8 num_bytes;
192         u8 bytes[255];
193 };
194 
195 struct drm_dp_remote_i2c_read_nak_reply {
196         u8 port_number;
197         u8 nak_reason;
198         u8 i2c_nak_transaction;
199 };
200 
201 struct drm_dp_remote_i2c_write_ack_reply {
202         u8 port_number;
203 };
204 
205 
206 struct drm_dp_sideband_msg_rx {
207         u8 chunk[48];
208         u8 msg[256];
209         u8 curchunk_len;
210         u8 curchunk_idx; /* chunk we are parsing now */
211         u8 curchunk_hdrlen;
212         u8 curlen; /* total length of the msg */
213         bool have_somt;
214         bool have_eomt;
215         struct drm_dp_sideband_msg_hdr initial_hdr;
216 };
217 
218 
219 struct drm_dp_allocate_payload {
220         u8 port_number;
221         u8 number_sdp_streams;
222         u8 vcpi;
223         u16 pbn;
224         u8 sdp_stream_sink[8];
225 };
226 
227 struct drm_dp_allocate_payload_ack_reply {
228         u8 port_number;
229         u8 vcpi;
230         u16 allocated_pbn;
231 };
232 
233 struct drm_dp_connection_status_notify {
234         u8 guid[16];
235         u8 port_number;
236         bool legacy_device_plug_status;
237         bool displayport_device_plug_status;
238         bool message_capability_status;
239         bool input_port;
240         u8 peer_device_type;
241 };
242 
243 struct drm_dp_remote_dpcd_read {
244         u8 port_number;
245         u32 dpcd_address;
246         u8 num_bytes;
247 };
248 
249 struct drm_dp_remote_dpcd_write {
250         u8 port_number;
251         u32 dpcd_address;
252         u8 num_bytes;
253         u8 *bytes;
254 };
255 
256 #define DP_REMOTE_I2C_READ_MAX_TRANSACTIONS 4
257 struct drm_dp_remote_i2c_read {
258         u8 num_transactions;
259         u8 port_number;
260         struct {
261                 u8 i2c_dev_id;
262                 u8 num_bytes;
263                 u8 *bytes;
264                 u8 no_stop_bit;
265                 u8 i2c_transaction_delay;
266         } transactions[DP_REMOTE_I2C_READ_MAX_TRANSACTIONS];
267         u8 read_i2c_device_id;
268         u8 num_bytes_read;
269 };
270 
271 struct drm_dp_remote_i2c_write {
272         u8 port_number;
273         u8 write_i2c_device_id;
274         u8 num_bytes;
275         u8 *bytes;
276 };
277 
278 /* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */
279 struct drm_dp_port_number_req {
280         u8 port_number;
281 };
282 
283 struct drm_dp_enum_path_resources_ack_reply {
284         u8 port_number;
285         u16 full_payload_bw_number;
286         u16 avail_payload_bw_number;
287 };
288 
289 /* covers POWER_DOWN_PHY, POWER_UP_PHY */
290 struct drm_dp_port_number_rep {
291         u8 port_number;
292 };
293 
294 struct drm_dp_query_payload {
295         u8 port_number;
296         u8 vcpi;
297 };
298 
299 struct drm_dp_resource_status_notify {
300         u8 port_number;
301         u8 guid[16];
302         u16 available_pbn;
303 };
304 
305 struct drm_dp_query_payload_ack_reply {
306         u8 port_number;
307         u8 allocated_pbn;
308 };
309 
310 struct drm_dp_sideband_msg_req_body {
311         u8 req_type;
312         union ack_req {
313                 struct drm_dp_connection_status_notify conn_stat;
314                 struct drm_dp_port_number_req port_num;
315                 struct drm_dp_resource_status_notify resource_stat;
316 
317                 struct drm_dp_query_payload query_payload;
318                 struct drm_dp_allocate_payload allocate_payload;
319 
320                 struct drm_dp_remote_dpcd_read dpcd_read;
321                 struct drm_dp_remote_dpcd_write dpcd_write;
322 
323                 struct drm_dp_remote_i2c_read i2c_read;
324                 struct drm_dp_remote_i2c_write i2c_write;
325         } u;
326 };
327 
328 struct drm_dp_sideband_msg_reply_body {
329         u8 reply_type;
330         u8 req_type;
331         union ack_replies {
332                 struct drm_dp_nak_reply nak;
333                 struct drm_dp_link_address_ack_reply link_addr;
334                 struct drm_dp_port_number_rep port_number;
335 
336                 struct drm_dp_enum_path_resources_ack_reply path_resources;
337                 struct drm_dp_allocate_payload_ack_reply allocate_payload;
338                 struct drm_dp_query_payload_ack_reply query_payload;
339 
340                 struct drm_dp_remote_dpcd_read_ack_reply remote_dpcd_read_ack;
341                 struct drm_dp_remote_dpcd_write_ack_reply remote_dpcd_write_ack;
342                 struct drm_dp_remote_dpcd_write_nak_reply remote_dpcd_write_nack;
343 
344                 struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack;
345                 struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack;
346                 struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack;
347         } u;
348 };
349 
350 /* msg is queued to be put into a slot */
351 #define DRM_DP_SIDEBAND_TX_QUEUED 0
352 /* msg has started transmitting on a slot - still on msgq */
353 #define DRM_DP_SIDEBAND_TX_START_SEND 1
354 /* msg has finished transmitting on a slot - removed from msgq only in slot */
355 #define DRM_DP_SIDEBAND_TX_SENT 2
356 /* msg has received a response - removed from slot */
357 #define DRM_DP_SIDEBAND_TX_RX 3
358 #define DRM_DP_SIDEBAND_TX_TIMEOUT 4
359 
360 struct drm_dp_sideband_msg_tx {
361         u8 msg[256];
362         u8 chunk[48];
363         u8 cur_offset;
364         u8 cur_len;
365         struct drm_dp_mst_branch *dst;
366         struct list_head next;
367         int seqno;
368         int state;
369         bool path_msg;
370         struct drm_dp_sideband_msg_reply_body reply;
371 };
372 
373 /* sideband msg handler */
374 struct drm_dp_mst_topology_mgr;
375 struct drm_dp_mst_topology_cbs {
376         /* create a connector for a port */
377         struct drm_connector *(*add_connector)(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, const char *path);
378         void (*register_connector)(struct drm_connector *connector);
379         void (*destroy_connector)(struct drm_dp_mst_topology_mgr *mgr,
380                                   struct drm_connector *connector);
381         void (*hotplug)(struct drm_dp_mst_topology_mgr *mgr);
382 
383 };
384 
385 #define DP_MAX_PAYLOAD (sizeof(unsigned long) * 8)
386 
387 #define DP_PAYLOAD_LOCAL 1
388 #define DP_PAYLOAD_REMOTE 2
389 #define DP_PAYLOAD_DELETE_LOCAL 3
390 
391 struct drm_dp_payload {
392         int payload_state;
393         int start_slot;
394         int num_slots;
395         int vcpi;
396 };
397 
398 /**
399  * struct drm_dp_mst_topology_mgr - DisplayPort MST manager
400  * @dev: device pointer for adding i2c devices etc.
401  * @cbs: callbacks for connector addition and destruction.
402  * @max_dpcd_transaction_bytes - maximum number of bytes to read/write in one go.
403  * @aux: aux channel for the DP connector.
404  * @max_payloads: maximum number of payloads the GPU can generate.
405  * @conn_base_id: DRM connector ID this mgr is connected to.
406  * @down_rep_recv: msg receiver state for down replies.
407  * @up_req_recv: msg receiver state for up requests.
408  * @lock: protects mst state, primary, guid, dpcd.
409  * @mst_state: if this manager is enabled for an MST capable port.
410  * @mst_primary: pointer to the primary branch device.
411  * @guid_valid: GUID valid for the primary branch device.
412  * @guid: GUID for primary port.
413  * @dpcd: cache of DPCD for primary port.
414  * @pbn_div: PBN to slots divisor.
415  *
416  * This struct represents the toplevel displayport MST topology manager.
417  * There should be one instance of this for every MST capable DP connector
418  * on the GPU.
419  */
420 struct drm_dp_mst_topology_mgr {
421 
422         struct device *dev;
423         struct drm_dp_mst_topology_cbs *cbs;
424         int max_dpcd_transaction_bytes;
425         struct drm_dp_aux *aux; /* auxch for this topology mgr to use */
426         int max_payloads;
427         int conn_base_id;
428 
429         /* only ever accessed from the workqueue - which should be serialised */
430         struct drm_dp_sideband_msg_rx down_rep_recv;
431         struct drm_dp_sideband_msg_rx up_req_recv;
432 
433         /* pointer to info about the initial MST device */
434         struct mutex lock; /* protects mst_state + primary + guid + dpcd */
435 
436         bool mst_state;
437         struct drm_dp_mst_branch *mst_primary;
438         /* primary MST device GUID */
439         bool guid_valid;
440         u8 guid[16];
441         u8 dpcd[DP_RECEIVER_CAP_SIZE];
442         u8 sink_count;
443         int pbn_div;
444         int total_slots;
445         int avail_slots;
446         int total_pbn;
447 
448         /* messages to be transmitted */
449         /* qlock protects the upq/downq and in_progress,
450            the mstb tx_slots and txmsg->state once they are queued */
451         struct mutex qlock;
452         struct list_head tx_msg_downq;
453         struct list_head tx_msg_upq;
454         bool tx_down_in_progress;
455         bool tx_up_in_progress;
456 
457         /* payload info + lock for it */
458         struct mutex payload_lock;
459         struct drm_dp_vcpi **proposed_vcpis;
460         struct drm_dp_payload *payloads;
461         unsigned long payload_mask;
462         unsigned long vcpi_mask;
463 
464         wait_queue_head_t tx_waitq;
465         struct work_struct work;
466 
467         struct work_struct tx_work;
468 
469         struct list_head destroy_connector_list;
470         struct mutex destroy_connector_lock;
471         struct work_struct destroy_connector_work;
472 };
473 
474 int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, struct device *dev, struct drm_dp_aux *aux, int max_dpcd_transaction_bytes, int max_payloads, int conn_base_id);
475 
476 void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr);
477 
478 
479 int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool mst_state);
480 
481 
482 int drm_dp_mst_hpd_irq(struct drm_dp_mst_topology_mgr *mgr, u8 *esi, bool *handled);
483 
484 
485 enum drm_connector_status drm_dp_mst_detect_port(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
486 
487 struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
488 
489 
490 int drm_dp_calc_pbn_mode(int clock, int bpp);
491 
492 
493 bool drm_dp_mst_allocate_vcpi(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, int pbn, int *slots);
494 
495 int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
496 
497 
498 void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
499 
500 
501 void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
502                                 struct drm_dp_mst_port *port);
503 
504 
505 int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
506                            int pbn);
507 
508 
509 int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr);
510 
511 
512 int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr);
513 
514 int drm_dp_check_act_status(struct drm_dp_mst_topology_mgr *mgr);
515 
516 void drm_dp_mst_dump_topology(struct seq_file *m,
517                               struct drm_dp_mst_topology_mgr *mgr);
518 
519 void drm_dp_mst_topology_mgr_suspend(struct drm_dp_mst_topology_mgr *mgr);
520 int drm_dp_mst_topology_mgr_resume(struct drm_dp_mst_topology_mgr *mgr);
521 #endif
522 

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